178 



REPORT — 1867. 



TBANSTEESE STBAIN, 



Exp. XIII.— Bar of Steel from Messrs. Charles CammeU & Co., Sheffield. 

 Dimension of bar 1-04 inch square. Length between suj)ports 

 4 feet 6 inches. Mark on bar, " 4." 



Eesults of E^ip. XIII. 



Here the weight (iv) at the limit of elasticity is 960 lbs., and the corre- 

 sponding deflection (2) is 1-106. 



By formula (6). — The mean value of the deflection for unity of pressure 

 and section (DJ = -0013254. 



By formula (7). — The mean value of the modulus of elasticity (E) 

 "= 29,700,000. 



By fornrala (2). — The modulus of elasticitv (E) corresponding to 112 lbs. 

 pressure = 30,120,000. 



Bv formula (8). — Work of deflection (IT) up to the limit of elasticity 

 = 44-240. 



Bj formula (9). — Work of deflection (m) for imity of section = 40-903. 



By formula (12). — Yalue of C, the unit of working strength = 5-132 tons. 



